2.1.4. Film Oil Resistance Ability

The oil absorption ratio was used to assess Ch-EPPE gel films' capacity for oil resistance in possible food packaging use (OAR). The findings revealed that the Ch-5% EPPE film had a lower OAR percentage (0.08 ± 0.001%) than the control film (Ch-0%EPPE), which had an OAR percentage of 0.31 ± 0.006% (Table 1). Ch-1% EPPE, Ch-3% EPPE, and Ch-5% EPPE films all showed a substantial reduction in OAR percentages, from 0.26 ± 0.004 to 0.08 ± 0.001%. This reduction may be due to the fact that CH contains a hydrophilic hydroxyl group in its structure, which acts with EPPE to increase the film thickness, making it more difficult for oil molecules to cross through them. As a result, low OAR values demonstrated greater oil resistance capacity, which is a favourable attribute for packaging materials for oil goods. Riaz et al. [32] observed similar findings.
